*
* Copyright 2010 Novell, Inc (http://www.novell.com)
* Copyright 2011 Xamarin Inc (http://www.xamarin.com)
+ * Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include <config.h>
* be done to the format.
*/
+ // Pending data to be written to the log, for a single thread.
+ // Threads periodically flush their own LogBuffers by calling safe_send
struct _LogBuffer {
+ // Next (older) LogBuffer in processing queue
LogBuffer *next;
+
uint64_t time_base;
uint64_t last_time;
uintptr_t ptr_base;
uintptr_t last_method;
uintptr_t obj_base;
uintptr_t thread_id;
- unsigned char* data_end;
- unsigned char* data;
int locked;
- int size;
int call_depth;
+
+ // Bytes allocated for this LogBuffer
+ int size;
+
+ // Start of currently unused space in buffer
+ unsigned char* cursor;
+
+ // Pointer to start-of-structure-plus-size (for convenience)
+ unsigned char* buf_end;
+
+ // Start of data in buffer. Contents follow "buffer format" described above.
unsigned char buf [1];
};
#define ENTER_LOG(lb,str) if ((lb)->locked) {ign_res (write(2, str, strlen(str))); ign_res (write(2, "\n", 1));return;} else {(lb)->locked++;}
#define EXIT_LOG(lb) (lb)->locked--;
+ // Shared queue of sample snapshots taken at signal time.
+ // The queue is written into by signal handlers for all threads;
+ // the helper thread later unqueues and writes into its own LogBuffer.
typedef struct _StatBuffer StatBuffer;
struct _StatBuffer {
+ // Next (older) StatBuffer in processing queue
StatBuffer *next;
+
+ // Bytes allocated for this StatBuffer
uintptr_t size;
- uintptr_t *data_end;
- uintptr_t *data;
+
+ // Start of currently unused space in buffer
+ uintptr_t *cursor;
+
+ // Pointer to start-of-structure-plus-size (for convenience)
+ uintptr_t *buf_end;
+
+ // Start of data in buffer.
+ // Data consists of a series of sample packets consisting of:
+ // 1 ptrword: Metadata
+ // Low 8 bits: COUNT, the count of native stack frames in this sample (currently always 1)
+ // Next 8 bits: MBT_COUNT, the count of managed stacks in this sample
+ // Next 8 bits: TYPE. See "sampling sources" enum in proflog.h. Usually SAMPLE_CYCLES (1)
+ // 1 ptrword: Thread ID
+ // 1 ptrword: Timestamp
+ // COUNT ptrwords: Native stack frames
+ // Each word is an IP (first is IP where the signal did the interruption)
+ // MBT_COUNT * 4 ptrwords: Managed stack frames (AsyncFrameInfo, repacked)
+ // Word 1: MonoMethod ptr
+ // Word 2: MonoDomain ptr
+ // Word 3: Base address of method
+ // Word 4: Offset within method
uintptr_t buf [1];
};
{
StatBuffer* buf = (StatBuffer *)alloc_buffer (BUFFER_SIZE);
buf->size = BUFFER_SIZE;
- buf->data_end = (uintptr_t*)((unsigned char*)buf + buf->size);
- buf->data = buf->buf;
+ buf->buf_end = (uintptr_t*)((unsigned char*)buf + buf->size);
+ buf->cursor = buf->buf;
return buf;
}
buf->size = BUFFER_SIZE;
buf->time_base = current_time ();
buf->last_time = buf->time_base;
- buf->data_end = (unsigned char*)buf + buf->size;
- buf->data = buf->buf;
+ buf->buf_end = (unsigned char*)buf + buf->size;
+ buf->cursor = buf->buf;
return buf;
}
static LogBuffer *
ensure_logbuf_inner (LogBuffer *old, int bytes)
{
- if (old && old->data + bytes + 100 < old->data_end)
+ if (old && old->cursor + bytes + 100 < old->buf_end)
return old;
LogBuffer *new_ = (LogBuffer *)create_buffer ();
static void
emit_byte (LogBuffer *logbuffer, int value)
{
- logbuffer->data [0] = value;
- logbuffer->data++;
- assert (logbuffer->data <= logbuffer->data_end);
+ logbuffer->cursor [0] = value;
+ logbuffer->cursor++;
+ assert (logbuffer->cursor <= logbuffer->buf_end);
}
static void
emit_value (LogBuffer *logbuffer, int value)
{
- encode_uleb128 (value, logbuffer->data, &logbuffer->data);
- assert (logbuffer->data <= logbuffer->data_end);
+ encode_uleb128 (value, logbuffer->cursor, &logbuffer->cursor);
+ assert (logbuffer->cursor <= logbuffer->buf_end);
}
static void
// printf ("time went backwards\n");
//if (tdiff > 1000000)
// printf ("large time offset: %llu\n", tdiff);
- encode_uleb128 (tdiff, logbuffer->data, &logbuffer->data);
+ encode_uleb128 (tdiff, logbuffer->cursor, &logbuffer->cursor);
/*if (tdiff != decode_uleb128 (p, &p))
printf ("incorrect encoding: %llu\n", tdiff);*/
logbuffer->last_time = value;
- assert (logbuffer->data <= logbuffer->data_end);
+ assert (logbuffer->cursor <= logbuffer->buf_end);
}
static void
emit_svalue (LogBuffer *logbuffer, int64_t value)
{
- encode_sleb128 (value, logbuffer->data, &logbuffer->data);
- assert (logbuffer->data <= logbuffer->data_end);
+ encode_sleb128 (value, logbuffer->cursor, &logbuffer->cursor);
+ assert (logbuffer->cursor <= logbuffer->buf_end);
}
static void
emit_uvalue (LogBuffer *logbuffer, uint64_t value)
{
- encode_uleb128 (value, logbuffer->data, &logbuffer->data);
- assert (logbuffer->data <= logbuffer->data_end);
+ encode_uleb128 (value, logbuffer->cursor, &logbuffer->cursor);
+ assert (logbuffer->cursor <= logbuffer->buf_end);
}
static void
if (!logbuffer->ptr_base)
logbuffer->ptr_base = (uintptr_t)ptr;
emit_svalue (logbuffer, (intptr_t)ptr - logbuffer->ptr_base);
- assert (logbuffer->data <= logbuffer->data_end);
+ assert (logbuffer->cursor <= logbuffer->buf_end);
}
static void
logbuffer->method_base = (intptr_t)method;
logbuffer->last_method = (intptr_t)method;
}
- encode_sleb128 ((intptr_t)((char*)method - (char*)logbuffer->last_method), logbuffer->data, &logbuffer->data);
+ encode_sleb128 ((intptr_t)((char*)method - (char*)logbuffer->last_method), logbuffer->cursor, &logbuffer->cursor);
logbuffer->last_method = (intptr_t)method;
- assert (logbuffer->data <= logbuffer->data_end);
+ assert (logbuffer->cursor <= logbuffer->buf_end);
}
/*
if (!logbuffer->obj_base)
logbuffer->obj_base = (uintptr_t)ptr >> 3;
emit_svalue (logbuffer, ((uintptr_t)ptr >> 3) - logbuffer->obj_base);
- assert (logbuffer->data <= logbuffer->data_end);
+ assert (logbuffer->cursor <= logbuffer->buf_end);
}
static void
if (buf->next)
dump_buffer (profiler, buf->next);
p = write_int32 (p, BUF_ID);
- p = write_int32 (p, buf->data - buf->buf);
+ p = write_int32 (p, buf->cursor - buf->buf);
p = write_int64 (p, buf->time_base);
p = write_int64 (p, buf->ptr_base);
p = write_int64 (p, buf->obj_base);
#if defined (HAVE_SYS_ZLIB)
if (profiler->gzfile) {
gzwrite (profiler->gzfile, hbuf, p - hbuf);
- gzwrite (profiler->gzfile, buf->buf, buf->data - buf->buf);
+ gzwrite (profiler->gzfile, buf->buf, buf->cursor - buf->buf);
} else {
#endif
fwrite (hbuf, p - hbuf, 1, profiler->file);
- fwrite (buf->buf, buf->data - buf->buf, 1, profiler->file);
+ fwrite (buf->buf, buf->cursor - buf->buf, 1, profiler->file);
fflush (profiler->file);
#if defined (HAVE_SYS_ZLIB)
}
emit_value (logbuffer, 0); /* flags */
emit_value (logbuffer, data->count);
//if (*p != data.count) {
- // printf ("bad num frames enc at %d: %d -> %d\n", count, data.count, *p); printf ("frames end: %p->%p\n", p, logbuffer->data); exit(0);}
+ // printf ("bad num frames enc at %d: %d -> %d\n", count, data.count, *p); printf ("frames end: %p->%p\n", p, logbuffer->cursor); exit(0);}
while (data->count) {
emit_method_as_ptr (prof, logbuffer, data->methods [--data->count]);
}
emit_byte (logbuffer, TYPE_IMAGE);
emit_ptr (logbuffer, image);
emit_value (logbuffer, 0); /* flags */
- memcpy (logbuffer->data, name, nlen);
- logbuffer->data += nlen;
+ memcpy (logbuffer->cursor, name, nlen);
+ logbuffer->cursor += nlen;
//printf ("loaded image %p (%s)\n", image, name);
EXIT_LOG (logbuffer);
if (logbuffer->next)
emit_byte (logbuffer, TYPE_IMAGE);
emit_ptr (logbuffer, image);
emit_value (logbuffer, 0); /* flags */
- memcpy (logbuffer->data, name, nlen);
- logbuffer->data += nlen;
+ memcpy (logbuffer->cursor, name, nlen);
+ logbuffer->cursor += nlen;
EXIT_LOG (logbuffer);
if (logbuffer->next)
emit_byte (logbuffer, TYPE_ASSEMBLY);
emit_ptr (logbuffer, assembly);
emit_value (logbuffer, 0); /* flags */
- memcpy (logbuffer->data, name, nlen);
- logbuffer->data += nlen;
+ memcpy (logbuffer->cursor, name, nlen);
+ logbuffer->cursor += nlen;
EXIT_LOG (logbuffer);
mono_free (name);
emit_byte (logbuffer, TYPE_ASSEMBLY);
emit_ptr (logbuffer, assembly);
emit_value (logbuffer, 0); /* flags */
- memcpy (logbuffer->data, name, nlen);
- logbuffer->data += nlen;
+ memcpy (logbuffer->cursor, name, nlen);
+ logbuffer->cursor += nlen;
EXIT_LOG (logbuffer);
mono_free (name);
emit_ptr (logbuffer, klass);
emit_ptr (logbuffer, image);
emit_value (logbuffer, 0); /* flags */
- memcpy (logbuffer->data, name, nlen);
- logbuffer->data += nlen;
+ memcpy (logbuffer->cursor, name, nlen);
+ logbuffer->cursor += nlen;
//printf ("loaded class %p (%s)\n", klass, name);
if (runtime_inited)
mono_free (name);
emit_ptr (logbuffer, klass);
emit_ptr (logbuffer, image);
emit_value (logbuffer, 0); /* flags */
- memcpy (logbuffer->data, name, nlen);
- logbuffer->data += nlen;
+ memcpy (logbuffer->cursor, name, nlen);
+ logbuffer->cursor += nlen;
EXIT_LOG (logbuffer);
if (runtime_inited)
emit_ptr (logbuffer, buffer);
emit_value (logbuffer, size);
if (name) {
- memcpy (logbuffer->data, name, nlen);
- logbuffer->data += nlen;
+ memcpy (logbuffer->cursor, name, nlen);
+ logbuffer->cursor += nlen;
}
EXIT_LOG (logbuffer);
process_requests (prof);
emit_byte (logbuffer, TYPE_DOMAIN);
emit_ptr (logbuffer, (void*)(uintptr_t) mono_domain_get_id (domain));
emit_value (logbuffer, 0); /* flags */
- memcpy (logbuffer->data, name, nlen);
- logbuffer->data += nlen;
+ memcpy (logbuffer->cursor, name, nlen);
+ logbuffer->cursor += nlen;
EXIT_LOG (logbuffer);
if (logbuffer->next)
emit_byte (logbuffer, TYPE_THREAD);
emit_ptr (logbuffer, (void*)tid);
emit_value (logbuffer, 0); /* flags */
- memcpy (logbuffer->data, name, len);
- logbuffer->data += len;
+ memcpy (logbuffer->cursor, name, len);
+ logbuffer->cursor += len;
EXIT_LOG (logbuffer);
if (logbuffer->next)
if (!sbuf)
return;
/* flush the buffer at 1 second intervals */
- if (sbuf->data > sbuf->buf && (elapsed - sbuf->buf [2]) > 100000) {
+ if (sbuf->cursor > sbuf->buf && (elapsed - sbuf->buf [2]) > 100000) {
timedout = 1;
}
/* overflow: 400 slots is a big enough number to reduce the chance of losing this event if many
* threads hit this same spot at the same time
*/
- if (timedout || (sbuf->data + 400 >= sbuf->data_end)) {
+ if (timedout || (sbuf->cursor + 400 >= sbuf->buf_end)) {
StatBuffer *oldsb, *foundsb;
sbuf = create_stat_buffer ();
do {
}
}
do {
- old_data = sbuf->data;
+ old_data = sbuf->cursor;
new_data = old_data + SAMPLE_EVENT_SIZE_IN_SLOTS (bt_data.count);
- data = (uintptr_t *)InterlockedCompareExchangePointer ((void * volatile*)&sbuf->data, new_data, old_data);
+ if (new_data > sbuf->buf_end)
+ return; /* Not enough room in buf to hold this event-- lost event */
+ data = (uintptr_t *)InterlockedCompareExchangePointer ((void * volatile*)&sbuf->cursor, new_data, old_data);
} while (data != old_data);
- if (old_data >= sbuf->data_end)
- return; /* lost event */
+
old_data [0] = 1 | (sample_type << 16) | (bt_data.count << 8);
old_data [1] = thread_id ();
old_data [2] = elapsed;
emit_svalue (logbuffer, load_addr);
emit_uvalue (logbuffer, offset);
emit_uvalue (logbuffer, size);
- memcpy (logbuffer->data, filename, len);
- logbuffer->data += len;
+ memcpy (logbuffer->cursor, filename, len);
+ logbuffer->cursor += len;
}
#endif
emit_byte (logbuffer, TYPE_SAMPLE | TYPE_SAMPLE_USYM);
emit_ptr (logbuffer, (void*)value);
emit_value (logbuffer, size);
- memcpy (logbuffer->data, name, len);
- logbuffer->data += len;
+ memcpy (logbuffer->cursor, name, len);
+ logbuffer->cursor += len;
}
/* ELF code crashes on some systems. */
g_ptr_array_set_size (prof->sorted_sample_events, 0);
- for (uintptr_t *sample = sbuf->buf; sample < sbuf->data;) {
+ for (uintptr_t *sample = sbuf->buf; sample < sbuf->cursor;) {
int count = sample [0] & 0xff;
int mbt_count = (sample [0] & 0xff00) >> 8;
- if (sample + SAMPLE_EVENT_SIZE_IN_SLOTS (mbt_count) > sbuf->data)
+ if (sample + SAMPLE_EVENT_SIZE_IN_SLOTS (mbt_count) > sbuf->cursor)
break;
g_ptr_array_add (prof->sorted_sample_events, sample);
void *address = (void*)managed_sample_base [i * 4 + 2];
if (!method) {
+ g_assert (domain);
MonoJitInfo *ji = mono_jit_info_table_find (domain, (char *)address);
if (ji)
emit_ptr (method_buffer, cstart);
emit_value (method_buffer, csize);
- memcpy (method_buffer->data, name, nlen);
- method_buffer->data += nlen;
+ memcpy (method_buffer->cursor, name, nlen);
+ method_buffer->cursor += nlen;
mono_free (name);
free (info);
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